happen/chance to …

结构︰

主语＋happen／chance＋to-不定词…

说明︰

此句型意为“…碰巧…”。

A friend of his happened to be sitting in a railroad-coach next to a young man who was obviously depressed.
他的一个朋友碰巧在火车车厢里坐在一个无精打采的年轻人的身边。
We happened to meet at the station.
我们碰巧在火车站相遇。
He happened to be sleeping.
他碰巧在睡觉。
I chanced to be thinking of the same thing.
我碰巧想到同样的事。